<template>
	<div>
		<!-- 面包屑导航区域 -->
		<el-breadcrumb separator-class="el-icon-arrow-right">
			<el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
			<el-breadcrumb-item>商品管理</el-breadcrumb-item>
			<el-breadcrumb-item>参数列表</el-breadcrumb-item>
		</el-breadcrumb>

		<!-- 卡片视图区域 -->
		<el-card>
			<!-- 警告区域 -->
			<el-alert show-icon title="注意: 只允许为第三级分类设置相关参数! " type="warning" :closable="false"></el-alert>

			<!-- 选择商品分类区域 -->
			<el-row class="cat_opt">
				<el-col>
					<span>选择商品分类: </span>
					<!-- 选择商品分类的级联选择框 -->
					<el-cascader v-model="selectedCateKeys" :options="catelist" :props="cateProps" @change="handleChange"></el-cascader>
				</el-col>
			</el-row>

			<!-- tab 页签区域 -->
			<el-tabs v-model="activeName" @tab-click="handleTabClick">
				<!-- 添加动态参数的面板 -->
				<el-tab-pane label="动态参数" name="many">
					<!-- 添加参数的按钮 -->
					<el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
					<!-- 动态参数表格 -->
					<el-table :data="manyTableData" border stripe>
						<!-- 展开行 -->
						<el-table-column type="expand">
							<template slot-scope="scope">
								<!-- 循环渲染Tag标签 -->
								<el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{ item }}</el-tag>
								<!-- 输入的文本框 -->
								<el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)"> </el-input>
								<!-- 添加按钮 -->
								<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
							</template>
						</el-table-column>
						<!-- 索引列 -->
						<el-table-column type="index"></el-table-column>
						<el-table-column label="参数名称" prop="attr_name"></el-table-column>
						<el-table-column label="操作">
							<template slot-scope="scope">
								<el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
								<el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
							</template>
						</el-table-column>
					</el-table>
				</el-tab-pane>
				<!-- 添加静态属性的面板 -->
				<el-tab-pane label="静态属性" name="only">
					<!-- 添加属性的按钮 -->
					<el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
					<!-- 静态属性表格 -->
					<el-table :data="onlyTableData" border stripe>
						<!-- 展开行 -->
						<el-table-column type="expand">
							<template slot-scope="scope">
								<!-- 循环渲染Tag标签 -->
								<el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{ item }}</el-tag>
								<!-- 输入的文本框 -->
								<el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)"> </el-input>
								<!-- 添加按钮 -->
								<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
							</template>
						</el-table-column>
						<!-- 索引列 -->
						<el-table-column type="index"></el-table-column>
						<el-table-column label="属性名称" prop="attr_name"></el-table-column>
						<el-table-column label="操作">
							<template slot-scope="scope">
								<el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
								<el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
							</template>
						</el-table-column>
					</el-table>
				</el-tab-pane>
			</el-tabs>
		</el-card>

		<!-- 添加参数的对话框 -->
		<el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @closed="addDialogClosed">
			<!-- 添加参数的对话框 -->
			<el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
				<el-form-item :label="titleText" prop="attr_name">
					<el-input v-model="addForm.attr_name"></el-input>
				</el-form-item>
			</el-form>
			<span slot="footer" class="dialog-footer">
				<el-button @click="addDialogVisible = false">取 消</el-button>
				<el-button type="primary" @click="addParams">确 定</el-button>
			</span>
		</el-dialog>

		<!-- 修改参数的对话框 -->
		<el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @closed="editDialogClosed">
			<!-- 添加参数的对话框 -->
			<el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
				<el-form-item :label="titleText" prop="attr_name">
					<el-input v-model="editForm.attr_name"></el-input>
				</el-form-item>
			</el-form>
			<span slot="footer" class="dialog-footer">
				<el-button @click="editDialogVisible = false">取 消</el-button>
				<el-button type="primary" @click="editParams">确 定</el-button>
			</span>
		</el-dialog>
	</div>
</template>

<script>
export default {
	data() {
		return {
			// 商品分类列表
			catelist: [],
			// 级联选择框的配置对象
			cateProps: {
				expandTrigger: 'hover',
				value: 'cat_id',
				label: 'cat_name',
				children: 'children'
			},
			// 级联选择框双向绑定的数组
			selectedCateKeys: [],
			// 被激活的页签的名称
			activeName: 'many',
			// 动态参数的数据
			manyTableData: [],
			// 静态属性的数据
			onlyTableData: [],
			// 控制添加对话框的显示与隐藏
			addDialogVisible: false,
			// 添加参数的表单数据对象
			addForm: {
				attr_name: ''
			},
			// 添加表单的验证规则对象
			addFormRules: {
				attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
			},
			// 控制修改对话框的显示与隐藏
			editDialogVisible: false,
			// 修改的表单数据对象
			editForm: {},
			// 修改表单的验证规则对象
			editFormRules: {
				attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
			}
			// 控制按钮与文本框的切换显示
			// inputVisible: false,
			// 文本框中输入的内容
			// inputValue: ''
		}
	},
	created() {
		this.getCateList()
	},
	methods: {
		// 获取所有的商品分类列表
		async getCateList() {
			const { data: res } = await this.$http.get('categories')
			if (res.meta.status !== 200) {
				return this.$message.error('获取商品分类失败! ')
			}

			this.catelist = res.data
			// console.log(this.catelist)
		},
		// 级联选择框选中项变化，会触发这个函数
		handleChange() {
			this.getParamsData()
		},
		// tab 页签点击事件的处理函数
		handleTabClick() {
			// console.log(this.activeName)
			this.getParamsData()
		},
		// 获取参数的列表数据
		async getParamsData() {
			// 证明选中的不是三级分类
			if (this.selectedCateKeys.length !== 3) {
				this.selectedCateKeys = []
				this.manyTableData = []
				this.onlyTableData = []
				return
			}

			// 证明选中的是三级分类
			// console.log(this.selectedCateKeys)
			// 根据所选的分类的Id，和当前所处的面板，获取对应的参数
			const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })

			if (res.meta.status !== 200) {
				return this.$message.error('获取参数列表失败! ')
			}

			console.log(res.data)
			res.data.forEach(item => {
				item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
				// 控制文本框的显示与隐藏
				item.inputVisible = false
				// 文本框中输入的值
				item.inputVisible = ''
			})
			if (this.activeName === 'many') {
				this.manyTableData = res.data
			} else {
				this.onlyTableData = res.data
			}
		},
		// 监听添加对话框的关闭事件
		addDialogClosed() {
			this.$refs.addFormRef.resetFields()
		},
		// 点击按钮，添加参数
		addParams() {
			this.$refs.addFormRef.validate(async valid => {
				if (!valid) return
				const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
					attr_name: this.addForm.attr_name,
					attr_sel: this.activeName
				})

				if (res.meta.status !== 201) {
					return this.$message.error('添加参数失败! ')
				}

				this.$message.success('添加参数成功! ')
				this.addDialogVisible = false
				this.getParamsData()
			})
		},
		// 点击按钮，展示修改对话框
		async showEditDialog(attr_id) {
			// 查询当前参数的信息
			const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, {
				params: { attr_sel: this.activeName }
			})

			if (res.meta.status !== 200) {
				return this.$message.error('获取参数信息失败! ')
			}

			this.editForm = res.data
			this.editDialogVisible = true
		},
		// 重置修改的表单
		editDialogClosed() {
			this.$refs.editFormRef.resetFields()
		},
		// 点击按钮，修改参数信息
		editParams() {
			this.$refs.editFormRef.validate(async valid => {
				if (!valid) return
				const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
					attr_name: this.editForm.attr_name,
					attr_sel: this.activeName
				})

				if (res.meta.status !== 200) {
					return this.$message.error('修改参数失败! ')
				}

				this.$message.success('修改参数成功! ')
				this.getParamsData()
				this.editDialogVisible = false
			})
		},
		// 根据id删除对应的参数项
		async removeParams(attr_id) {
			const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
				confirmButtonText: '确定',
				cancelButtonText: '取消',
				type: 'warning'
			}).catch(err => err)

			// 用户取消了删除的操作
			if (confirmResult !== 'confirm') {
				return this.$message.info('已取消删除! ')
			}

			// 删除的业务逻辑
			const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)

			if (res.meta.status !== 200) {
				return this.$message.error('删除参数失败！')
			}

			this.$message.success('删除参数成功! ')
			this.getParamsData()
		},
		// 文本框失去焦点，或按下了Enter都会触发
		async handleInputConfirm(row) {
			if (row.inputValue.trim().length === 0) {
				row.inputValue = ''
				row.inputVisible = false
				return
			}
			// 如果没有return，则证明输入的内容，需要做后续处理
			row.attr_vals.push(row.inputValue.trim())
			row.inputValue = ''
			row.inputVisible = false
			// 需要发起请求，保存这次操作
			this.saveAttrVals(row)
		},
		// 将对 attr_vals 的操作，保存到数据库
		async saveAttrVals(row) {
			// 需要发起请求，保存这次操作
			const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
				attr_name: row.attr_name,
				attr_sel: row.attr_sel,
				attr_vals: row.attr_vals.join(' ')
			})

			if (res.meta.status !== 200) {
				return this.$message.error('修改参数项失败!')
			}

			this.$message.success('修改参数项成功!')
		},
		// 点击按钮，展开文本输入框
		showInput(row) {
			row.inputVisible = true
			// 让文本框自动获得焦点
			// $nextTick 方法的作用，就是当页面上的元素被重新渲染之后，才会指定回调函数中的代码
			this.$nextTick(_ => {
				this.$refs.saveTagInput.$refs.input.focus()
			})
		},
		// 删除对应参数的可选项
		handleClose(i, row) {
			row.attr_vals.splice(i, 1)
			this.saveAttrVals(row)
		}
	},
	computed: {
		// 如果按钮需要被禁用，则返回true，否则返回false
		isBtnDisabled() {
			if (this.selectedCateKeys.length !== 3) {
				return true
			}
			return false
		},
		// 当前选中的三级分类的Id
		cateId() {
			if (this.selectedCateKeys.length === 3) {
				return this.selectedCateKeys[2]
			}
			return null
		},
		// 动态计算标题的文本
		titleText() {
			if (this.activeName === 'many') {
				return '动态参数'
			}
			return '静态属性'
		}
	}
}
</script>

<style lang="less" scoped>
.cat_opt {
	margin: 15px 0;
}

.el-tag {
	margin: 10px;
}

.input-new-tag {
	width: 120px;
}
</style>
